78478393 has 8 divisors (see below), whose sum is σ = 89929280. Its totient is φ = 67087440.

The previous prime is 78478381. The next prime is 78478403. The reversal of 78478393 is 39387487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-78478393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78478343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12138 + ... + 17443.

It is an arithmetic number, because the mean of its divisors is an integer number (11241160).

Almost surely, 2^78478393 is an apocalyptic number.

It is an amenable number.

78478393 is a deficient number, since it is larger than the sum of its proper divisors (11450887).

78478393 is a wasteful number, since it uses less digits than its factorization.

78478393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29967.

The product of its digits is 1016064, while the sum is 49.

The square root of 78478393 is about 8858.8031358643. The cubic root of 78478393 is about 428.1375969654.

The spelling of 78478393 in words is "seventy-eight million, four hundred seventy-eight thousand, three hundred ninety-three".